feat(waitlist): make the day-part preference, the conversion and the expiry real

Three rows of task 13 were storing data nothing ever read.

`preferred_day_parts` was saved and displayed but never applied when matching.
It was deferred because "evening" has no fixed meaning — but branches already
carry a timezone (DoctorAddress::getTimezone), so the boundaries can be pinned:
morning [6,12), afternoon [12,17), evening [17,22), in the branch's local hour.
The list is now closed and validated; an unknown part is a 422 rather than a
preference that silently matches nothing. The filter runs *before* the cut to
ten recipients — otherwise the first ten slots go to people who did not want
that hour and the real eleventh person is never told.

`markConverted()` was dead code: nothing called it. It now runs off the
AppointmentBooked domain event rather than from inside BookingService, because
converting is a side effect of booking — inside the booking transaction a
waitlist error could roll back the patient's actual appointment. The match is
deliberately narrow (same patient, same service, start inside the window); a
loose match closes a row the patient is still waiting on. It is idempotent, so
redelivery is harmless.

Expiry now exists as a service, a daily scheduled message and
`app:waitlist:expire`. Expired rows were already excluded from matching, so
this is display hygiene, not a behaviour fix: without it the waitlist page
fills with dead entries and the operator cannot tell which are still live. It
sets a status rather than deleting — who waited and never got a slot is data.

Also: a waitlist window is capped at 90 days, matching the booking horizon. An
unbounded window is a row that never expires and shows up in every match.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

assets/admin/pages/WaitlistPage.tsx

@@ -9,6 +9,16 @@ import { usePermissions } from '../hooks/usePermissions';
 import { useWaitlist } from '../hooks/useCancellation';
 import type { WaitlistEntry } from '../types';
 
+/**
+ * مرزهای ساعتش در بک‌اند است (`WaitlistEntry::DAY_PARTS`)؛ اینجا فقط ترجمهٔ نمایش.
+ * تعریف مرز در دو جا یعنی روزی که یکی عوض شود، بیمار برای ساعتی خبر شود که رد کرده بود.
+ */
+const DAY_PART_LABELS: Record<string, string> = {
+  morning: 'صبح',
+  afternoon: 'بعدازظهر',
+  evening: 'عصر',
+};
+
 const STATUS: Record<WaitlistEntry['status'], { label: string; className: string }> = {
   waiting: { label: 'در انتظار', className: 'badge' },
   notified: { label: 'خبر داده شد', className: 'badge amber' },
@@ -53,7 +63,9 @@ export default function WaitlistPage() {
       header: 'زمان ترجیحی',
       render: (e) => (
         <span style={{ fontSize: 12, color: 'var(--text-2)' }}>
-          {e.preferred_day_parts.length === 0 ? 'بی‌تفاوت' : e.preferred_day_parts.join('، ')}
+          {e.preferred_day_parts.length === 0
+            ? 'بی‌تفاوت'
+            : e.preferred_day_parts.map((p) => DAY_PART_LABELS[p] ?? p).join('، ')}
         </span>
       ),
     },